SummaryUnconventional superconductivity is extensively sought for in contemporary research. Of particular interest are chiral superconductors which possess non-trivial topological properties resulting in superconducting (SC) order parameters (OPs) that may break time-reversal symmetry (TRS). The possibility of applications to topological quantum computation have placed such materials at the forefront of condensed matter research. Recent measurements of the polar Kerr effect (PKE), in which a rotation of polarization is detected for a beam of light reflected from the surface of a superconductor, have emerged as a key experimental probe of TRS breaking. Here we propose the development of a new generation of spectroscopic instrumentation for the PKE spectroscopy in the sub-THz frequency range, the energy scale that is comparable with the SC gap magnitude of unconventional superconductors. The THz range PKE spectroscopy will enable to study the broken symmetries, the origin of unconventional pairing, the in-gap collective modes, and the structures of the SC OPs. We plan to measure the PKE at sub-THz frequencies and with sub-milli-radian angular resolution from a variety of unconventional superconductors that are cooled to 100 mK, deep into SC state. The aim is to understand the basic mechanisms leading to unconventional superconductivity in these systems in order to find answers to the fundamental questions, such as: What is the structure of the SC gap in Sr2RuO4, URu2Si2, and UPt3? Is the TRS broken in (a) the Hidden Order state and in (b) SC state of URu2Si2? Which symmetries are broken at the transition from the HO state into the unconventional SC state? – and to elucidate the microscopic origin of superconductivity in the new families of unconventional superconductors. In a broader view, the project will keep Estonian physics on the forefront of science through new scientific contacts and will promote physics education by engaging students and postdocs in the research.

Unconventional superconductivity is extensively sought for in contemporary research. Of particular interest are chiral superconductors which possess non-trivial topological properties resulting in superconducting (SC) order parameters (OPs) that may break time-reversal symmetry (TRS). The possibility of applications to topological quantum computation have placed such materials at the forefront of condensed matter research. Recent measurements of the polar Kerr effect (PKE), in which a rotation of polarization is detected for a beam of light reflected from the surface of a superconductor, have emerged as a key experimental probe of TRS breaking. Here we propose the development of a new generation of spectroscopic instrumentation for the PKE spectroscopy in the sub-THz frequency range, the energy scale that is comparable with the SC gap magnitude of unconventional superconductors. The THz range PKE spectroscopy will enable to study the broken symmetries, the origin of unconventional pairing, the in-gap collective modes, and the structures of the SC OPs. We plan to measure the PKE at sub-THz frequencies and with sub-milli-radian angular resolution from a variety of unconventional superconductors that are cooled to 100 mK, deep into SC state. The aim is to understand the basic mechanisms leading to unconventional superconductivity in these systems in order to find answers to the fundamental questions, such as: What is the structure of the SC gap in Sr2RuO4, URu2Si2, and UPt3? Is the TRS broken in (a) the Hidden Order state and in (b) SC state of URu2Si2? Which symmetries are broken at the transition from the HO state into the unconventional SC state? – and to elucidate the microscopic origin of superconductivity in the new families of unconventional superconductors. In a broader view, the project will keep Estonian physics on the forefront of science through new scientific contacts and will promote physics education by engaging students and postdocs in the research.

Max ERC Funding

2 489 976 €

Duration

Start date: 2021-01-01, End date: 2025-12-31

Project acronymTRANSLATING MEMORIES

ProjectTranslating Memories: The Eastern European Past in the Global Arena

Researcher (PI)Eneken Laanes

Host Institution (HI)TALLINN UNIVERSITY

Call DetailsStarting Grant (StG), SH5, ERC-2019-STG

SummaryThe proposed project offers a new understanding of transnational memory as a process of translation by focusing on post-Soviet Eastern European attempts to make their local histories of the Second World War and the Socialist regime known globally. It examines these efforts through aesthetic media of memory – literature, film and art – that circulate globally and bring local experiences to global audiences and through the heated public debates that these works of art have provoked in different national and transnational contexts. It argues that the recently reinforced comparative and competitive political discourses about twentieth-century totalitarianisms in Eastern Europe can only be understood by exploring the arts that have developed more productive comparative and translational approaches and can therefore help to untangle the most recalcitrant nodes of confrontational political discourses and addressing the ethical and political complexity of remembering war and state terror. The project innovates methodologically by bringing together transcultural memory studies, translation theory and world literature studies to offer translation as a new model for conceptualising the transnational travel of memories that operates through transcultural memorial forms. What memorial forms have been used to make Eastern European memories intelligible in the global arena? What is gained and what is lost in this translation? What can the different ways that aesthetic acts of memory are received nationally and transnationally tell us about the frictions between these scales of memory and within the national itself? How has the globalisation of memory practices reinforced national memory in Eastern Europe? In providing the answers to these questions the project offers a transnational view of Eastern European attempts to negotiate their entangled histories of twentieth-century totalitarianisms within the global framework.

The proposed project offers a new understanding of transnational memory as a process of translation by focusing on post-Soviet Eastern European attempts to make their local histories of the Second World War and the Socialist regime known globally. It examines these efforts through aesthetic media of memory – literature, film and art – that circulate globally and bring local experiences to global audiences and through the heated public debates that these works of art have provoked in different national and transnational contexts. It argues that the recently reinforced comparative and competitive political discourses about twentieth-century totalitarianisms in Eastern Europe can only be understood by exploring the arts that have developed more productive comparative and translational approaches and can therefore help to untangle the most recalcitrant nodes of confrontational political discourses and addressing the ethical and political complexity of remembering war and state terror. The project innovates methodologically by bringing together transcultural memory studies, translation theory and world literature studies to offer translation as a new model for conceptualising the transnational travel of memories that operates through transcultural memorial forms. What memorial forms have been used to make Eastern European memories intelligible in the global arena? What is gained and what is lost in this translation? What can the different ways that aesthetic acts of memory are received nationally and transnationally tell us about the frictions between these scales of memory and within the national itself? How has the globalisation of memory practices reinforced national memory in Eastern Europe? In providing the answers to these questions the project offers a transnational view of Eastern European attempts to negotiate their entangled histories of twentieth-century totalitarianisms within the global framework.